openmp: Make c_omp_check_loop_binding_exprs diagnostics translatable [PR114364]

openmp: Make c_omp_check_loop_binding_exprs diagnostics translatable [PR114364]

c_omp_check_loop_binding_exprs with check_loop_binding_expr was composing
diagnostics from a format string with %s that provided additional words (but not
keywords).  That is a big no no for translations, both because the translator
can't choose a different word order and because the %s part wasn't translated
at all (would need to use _("...") to get translated), so this patch rewrites it
such that the whole messages are in the format strings.

2024-03-19  Jakub Jelinek  <jakub@redhat.com>

	PR c/114364
	* c-omp.cc (enum check_loop_binding_expr_ctx): New type.
	(check_loop_binding_expr): Remove context argument, add ctx
	argument with check_loop_binding_expr_ctx type at the end.  Don't
	create diagnostic message from multiple pieces.
	(c_omp_check_loop_binding_exprs): Adjust callers.